CN111624145A - Dust concentration on-line monitoring system based on dust concentration meter - Google Patents
Dust concentration on-line monitoring system based on dust concentration meter Download PDFInfo
- Publication number
- CN111624145A CN111624145A CN202010546796.6A CN202010546796A CN111624145A CN 111624145 A CN111624145 A CN 111624145A CN 202010546796 A CN202010546796 A CN 202010546796A CN 111624145 A CN111624145 A CN 111624145A
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- dust concentration
- differential pressure
- pressure transmitter
- pitot tube
- micro differential
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- 239000000428 dust Substances 0.000 title claims abstract description 90
- 238000012544 monitoring process Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 239000000523 sample Substances 0.000 claims description 57
- 238000012360 testing method Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 abstract description 12
- 238000007405 data analysis Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 49
- 238000010926 purge Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 210000003437 trachea Anatomy 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
- G01P5/16—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid using Pitot tubes, e.g. Machmeter
Abstract
A dust concentration online monitoring system based on a dust concentration meter relates to the technical field of dust monitoring, and comprises wind speed detection equipment, the dust concentration meter and a PLC (programmable logic controller), wherein a signal wire of the wind speed detection equipment is connected with the PLC; wind speed compensation of dust concentration detection is implemented by wind speed detection equipment, system accuracy is improved, comparison and data analysis are carried out on the calculated dust concentration through a PLC, real-time monitoring is carried out on the equipment, and the wind speed compensation can be used for monitoring bag breaking of a pulse dust collector, fault monitoring of an electromagnetic valve of a blowing system and monitoring of a blowing gas circuit.
Description
Technical Field
The invention relates to the technical field of dust monitoring, and is suitable for online monitoring of dust concentration of flue gas of industrial fields and equipment.
Background
With the rapid development of industry, the waste gas and waste discharged by the industry are more and more, and the damage to human and environment is increasingly serious. Among many pollutants, the harm of dust pollutants is gradually increasing, and more attention is paid to the dust pollutants. Dust refers to solid particles having a particle size of less than 75 μm suspended in air. The accumulation of dust in the lungs increases gradually due to the long-term inhalation of dust by workers who have been in contact with productive dust for a long time, and pneumoconiosis can be caused when a certain amount of dust is reached.
The Chinese patent application 2019105102748 discloses a "bag-breaking intelligent detection method for pulse bag type dust collector", the pulse bag type dust collector includes at least one box-separating chamber, the multiple box-separating chambers have total gas outlet and gas inlet, the total gas outlet and gas inlet are main gas outlet and main gas inlet respectively, each box-separating chamber is divided into blowing chamber and filtering chamber, the blowing chamber is located above the blowing chamber and the filtering chamber is located below the blowing chamber by separating pore plate, each box-separating chamber has sub gas inlet and sub gas outlet, the sub gas inlet is located at the lower side or lower end of the box-separating chamber, the sub gas outlet is located at the upper side or upper end of the box-separating chamber, the pulse bag type dust collector also includes concentration detector arranged at the gas outlet, the pulse bag type dust collector also includes first main pressure detector and second main pressure detector respectively arranged at the main gas outlet and main gas inlet, and first sub pressure detector with detection end arranged in the blowing chamber and detection end located above the pore plate, And the detection end is arranged in the filter chamber and is positioned on a second partial pressure detector below the pore plate. The dust online monitoring system of the dust remover has the following problems: 1, the structure configuration is generally huge and expensive; 2, the sensor can affect the deviation of detected data on the changes of wind speed, flow and pressure difference of detected gas, and the system accuracy is still not ideal; 3, the dust concentration detector who uses can pile up a layer dust on its probe rod after long-time the use, can influence the accuracy that detects numerical value.
Disclosure of Invention
The invention provides a dust concentration on-line monitoring system based on a dust concentration meter, which is low in price and improves the system accuracy. The added wind speed detection equipment is matched with the dust concentration meter to respectively transmit signals to the control system, the control system calculates a dust concentration value by online compensation of wind speed, flow, differential pressure and the like according to dust charge signals, and the detection precision is higher.
The method is implemented specifically as follows: the utility model provides a dust concentration on-line monitoring system based on dust concentration appearance, includes wind speed check out test set, dust concentration appearance, PLC controller, its characterized in that wind speed check out test set signal line connection PLC controller, dust concentration appearance signal line connection PLC controller, PLC controller pass through the switch respectively the signal line connect touch-sensitive screen and computer. The working principle of the dust concentration meter is that gas flows through a probe of the dust concentration meter, the probe adopts a charge induction principle, collected charge signals are sent to the dust concentration meter, a standard electric signal is given to a PLC (programmable logic controller) through calculation, the gas flows through a wind speed detection device, the gas flow speed, flow and gas differential pressure are calculated, a standard electric signal is given to the PLC, the PLC calculates according to the collected dust charge signals, the flow speed, the flow and the gas differential pressure to obtain a dust concentration value, and data are displayed to a user through a touch screen. The influence of wind speed on dust concentration detection is corrected through wind speed compensation in the system, the system accuracy is improved, and the whole set of device is installed at the air outlet of the dust remover, so that the size is small and the cost is low.
The dust concentration instrument is an ash removal type dust concentration instrument and comprises a probe rod, wherein the front part of the probe rod is arranged in an air pipe, the rear part of the probe rod is positioned outside the air pipe, a sleeve is arranged on the periphery of the probe rod outside the air pipe, one end of the sleeve is communicated with the air pipe, the other end of the sleeve is closed, the sleeve is connected with a compressed air source through an air pipe, and an electromagnetic valve is arranged on the air pipe. Through the detection probe rod upper end at dust concentration appearance (being the tuber pipe outside portion), increase one section sleeve pipe, be connected to the solenoid valve through the trachea, open through the timing of control solenoid valve, introduce compressed gas, sweep concentration appearance probe rod, can not pile up the dust above making the probe rod, guaranteed the accuracy of detecting numerical value.
The end of the sleeve of the dust concentration meter is flush with the inner wall of the air pipe, the probe rod in the air pipe close to the inner wall of the air pipe is provided with the elastic sealing ring, and the elastic sealing ring is tightly attached to the inner wall of the air pipe, so that the probe rod is ensured to be fastened and the probe rod is kept sealed at the position connected into the air pipe.
The invention relates to a wind speed detection device of a dust removal type pitot tube, which comprises a pitot tube and a micro differential pressure transmitter, wherein a signal line of the micro differential pressure transmitter is connected with a PLC controller, two ends of the micro differential pressure transmitter are connected to a pitot tube probe through gas pipes, the pitot tube probe, the gas pipes and the micro differential pressure transmitter form a first closed loop, a gas pipe communicated with a compressed gas source is connected with the micro differential pressure transmitter in parallel and forms a second closed loop with the pitot tube probe, and two electromagnetic valves are arranged at two ends of the gas pipe of the compressed gas which is connected with the micro differential pressure transmitter, is close to the parallel connection point and is arranged on the connecting gas pipe of the micro. After the pitot tube is fixedly arranged in the air pipe, the air pipe is connected to a pressure measuring port of the micro-differential pressure transmitter to detect differential pressure and convert the differential pressure into air speed to transmit signals. In the use process, the two electromagnetic valves forming a first closed loop with the micro differential pressure transmitter are normally opened, and normal online detection is kept. And two electromagnetic valves in the compressed gas closed loop II can be used for sweeping the pitot tube probe at regular time so as to ensure that the surface of the probe is smooth and has no dust accumulation. And in the purging process, firstly closing the two electromagnetic valves forming the first closed loop with the micro differential pressure transmitter, then opening the two electromagnetic valves in the second compressed gas closed loop, closing the two electromagnetic valves after the purging time is finished, then opening the two electromagnetic valves forming the first closed loop with the micro differential pressure transmitter, and continuously carrying out online detection.
Above-mentioned deashing type pitot tube wind speed check out test set needs 4 solenoid valves to carry out the deashing and washs, and wherein two solenoid valves need long-term circular telegrams moreover, can influence solenoid valve life, increase the maintenance cost.
The better wind speed detection equipment adopts low-power-consumption deashing type pitot tube wind speed detection equipment, and comprises a pitot tube and a micro differential pressure transmitter, wherein a signal line of the micro differential pressure transmitter is connected with a PLC (programmable logic controller), two ends of the micro differential pressure transmitter are connected to a pitot tube probe through a gas pipe, the pitot tube probe, the gas pipe and the micro differential pressure transmitter form a first closed loop, a gas pipe communicated with a compressed gas source is connected with the micro differential pressure transmitter in parallel and forms a second closed loop with the pitot tube probe, two-position three-way electromagnetic valves are respectively arranged at two parallel connection points, the A end and the B end of each two-position three-way electromagnetic valve are connected with the pitot tube probe and the first closed loop formed by the micro differential pressure transmitter, and the C end and the B end of each two-position.
The two-position three-way electromagnetic valve is a straight-through two-position three-way electromagnetic valve, a closed loop I formed by the straight-through A end and the B end, the pitot tube probe and the micro differential pressure transmitter is in a working state when the power is off, and a closed loop II formed by the vertical C end and the pitot tube probe and the compressed gas pipe connected with the micro differential pressure transmitter in parallel is in a working state when the power is on. By utilizing the characteristics of the direct-acting two-position three-way electromagnetic valve, long-term electrification is not needed, the number of controller points can be reduced in hardware, the circuit is also reduced, and the hardware investment cost is low. After the pitot tube is fixedly arranged in the air pipe, the air pipe is connected to a pressure measuring port of the micro-differential pressure transmitter to detect differential pressure and convert the differential pressure into air speed to transmit signals. In the use process, when the two-position three-way electromagnetic valve is powered off, the A end and the B end are directly connected, and work with a closed loop formed by a pitot tube and a micro differential pressure transmitter to realize the detection of differential pressure. After working for a certain time, the pitot tube probe is required to be purged of accumulated dust, the straight two-position three-way electromagnetic valve is powered on, the A end and the B end are disconnected, the vertical C end and the B end are powered on, the pitot tube and a closed loop formed by a compressed gas pipe connected in parallel with the micro differential pressure transmitter work to realize the timed purging of the pitot tube probe, and the electromagnetic valve is powered off to continue to detect differential pressure by the A-B after purging is finished. The device is particularly suitable for various severe test occasions such as high dust and the like.
The compressed gas used in the device is compressed air or inert gas, and for some media which can not use the compressed air, the inert gas is used so as to avoid secondary pollution to products.
Compared with the prior art, the technology has the remarkable advantages that:
1. wind speed compensation of dust concentration detection is implemented by wind speed detection equipment, and system accuracy is improved.
2. Through the PLC controller, the dust concentration obtained through calculation is compared and subjected to data analysis, real-time monitoring is carried out on the equipment, and the monitoring device can be used for monitoring broken bags of a pulse dust collector, monitoring faults of an electromagnetic valve of a blowing system and monitoring a blowing gas circuit.
3. A self-cleaning blowing device is arranged for the dust concentration instrument, the probe rod is blown and swept at regular time by compressed gas, dust is not easy to accumulate on the probe rod, and the detection accuracy can be ensured after long-time operation.
4. The ash removal type pitot tube wind speed detection equipment is adopted or the electromagnetic valve layout is reasonably planned, online detection and timed blowing and dust removal on a pitot tube probe are achieved, particularly, the ash removal type pitot tube wind speed detection equipment with low power consumption utilizes the characteristic of a straight-through two-position three-way electromagnetic valve to switch detection and blowing, the electromagnetic valve does not need to be electrified for a long time, only needs to be electrified when being blown regularly, low power consumption is achieved, and the pitot tube wind speed detection equipment is more economical and practical.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic structural view of a soot cleaning type soot concentration meter.
Fig. 3 is a dust cleaning type pitot tube wind speed detection device.
FIG. 4 is a low power consumption ash removal type pitot tube wind speed detection device.
Detailed Description
Embodiment 1, a dust concentration on-line monitoring system based on dust concentration appearance, including wind speed check out test set 1, dust concentration appearance 2, PLC controller 3, wind speed check out test set 1 signal line connection PLC controller 3, dust concentration appearance 2 signal line connection PLC controller 3, PLC controller passes through switch 4 respectively signal line connection touch-sensitive screen 5 and computer 6.
The wind speed detection device 1 is a dust removal type pitot tube wind speed detection device and comprises a pitot tube 11 and a micro differential pressure transmitter 12, wherein two ends of the micro differential pressure transmitter 12 are connected to a probe of the pitot tube 11 through a gas pipe, the probe of the pitot tube 11, the gas pipe and the micro differential pressure transmitter 12 form a first closed loop, a gas pipe communicated with a compressed gas source is connected with the micro differential pressure transmitter 12 in parallel and forms a second closed loop with the probe of the pitot tube 11, two parallel connection points and a connection gas pipe of the micro differential pressure transmitter 12 are respectively provided with a solenoid valve 13 and a solenoid valve 15, and two ends of the gas pipe of the compressed gas close to the parallel connection points and connected with the micro differential pressure transmitter. During normal detection, the electromagnetic valve 13 and the electromagnetic valve 15 are normally opened, and the electromagnetic valve 14 and the electromagnetic valve 16 are used for purging the pitot tube 11 probe regularly. In the purging process, the electromagnetic valve 13 and the electromagnetic valve 15 are closed, then the electromagnetic valve 14 and the electromagnetic valve 16 are opened, after the purging time is finished, the electromagnetic valve 14 and the electromagnetic valve 16 are closed, and then the electromagnetic valve 13 and the electromagnetic valve 15 are opened for continuous detection.
The wind speed detection device 1 is a low-power-consumption ash-removing pitot tube wind speed detection device and comprises a pitot tube 11 and a micro differential pressure transmitter 12, wherein two ends of the micro differential pressure transmitter 12 are connected to a probe of the pitot tube 11 through gas pipes, the probe of the pitot tube 11, the gas pipes and the micro differential pressure transmitter 12 form a first closed loop, a gas pipe communicated with a compressed gas source is connected with the micro differential pressure transmitter 12 in parallel and forms a second closed loop with the probe of the pitot tube 11, a straight-through two-position three-way electromagnetic valve 17 and a straight-through two-position three-way electromagnetic valve 18 are respectively arranged at two parallel connection points, in the using process, the straight-through two-position three-way electromagnetic valve 17 and the straight-through two-position three-way electromagnetic valve 18 detect differential pressure through A-B, the straight-through two-position three-way electromagnetic valve 17, The straight-through two-position three-way electromagnetic valve 18 is powered off and the differential pressure is detected by the A-B.
Claims (6)
1. The utility model provides a dust concentration on-line monitoring system based on dust concentration appearance, includes wind speed check out test set, dust concentration appearance, PLC controller, its characterized in that wind speed check out test set signal line connection PLC controller, dust concentration appearance signal line connection PLC controller, PLC controller pass through the switch respectively the signal line connect touch-sensitive screen and computer.
2. The online dust concentration monitoring system based on the dust concentration instrument as claimed in claim 1, wherein the dust concentration instrument is a dust cleaning type dust concentration instrument, and comprises a probe rod, the front part of the probe rod is installed in the air duct, the rear part of the probe rod is located outside the air duct, a sleeve is arranged on the periphery of the probe rod outside the air duct, one end of the sleeve is communicated with the air duct, the other end of the sleeve is closed, the sleeve is connected with a compressed air source through an air duct, and an electromagnetic valve is installed on the air duct.
3. The online dust concentration monitoring system based on the dust concentration meter as claimed in claim 2, wherein the end of the sleeve of the dust concentration meter is flush with the inner wall of the air duct, and the probe rod in the air duct close to the inner wall of the air duct is provided with an elastic sealing ring which is tightly attached to the inner wall of the air duct.
4. The online dust concentration monitoring system based on the dust concentration meter according to claim 1, characterized in that the wind speed detection device is a dust cleaning pitot tube wind speed detection device, which comprises a pitot tube and a micro differential pressure transmitter, a signal line of the micro differential pressure transmitter is connected with a PLC controller, two ends of the micro differential pressure transmitter are connected with a pitot tube probe through a gas pipe, the pitot tube probe, the gas pipe and the micro differential pressure transmitter form a first closed loop, the gas pipe communicated with a compressed gas source is connected with the micro differential pressure transmitter in parallel and forms a second closed loop with the pitot tube probe, and two electromagnetic valves are arranged at two ends of the gas pipe of the compressed gas, which is on the connecting gas pipe of the micro differential pressure transmitter, is close to the parallel connection point and is connected with the micro differential pressure transmitter.
5. The on-line dust concentration monitoring system based on the dust concentration meter in claim 1, the device is characterized in that the wind speed detection equipment is low-power-consumption ash-cleaning pitot tube wind speed detection equipment and comprises a pitot tube and a micro differential pressure transmitter, a signal line of the micro differential pressure transmitter is connected with a PLC (programmable logic controller), two ends of the micro differential pressure transmitter are connected with a pitot tube probe through air pipes, the pitot tube probe, the air pipes and the micro differential pressure transmitter form a first closed loop, the air pipe communicated with a compressed air source is connected with the micro differential pressure transmitter in parallel, and the closed loop II is formed by the pitot tube probe and a compressed gas pipe which is connected with the micro differential pressure transmitter in parallel.
6. The online dust concentration monitoring system based on the dust concentration instrument as claimed in claim 5, wherein the two-position three-way solenoid valve is a straight-through two-position three-way solenoid valve, a closed loop I formed by the straight-through A and B ends, the pitot tube probe and the micro differential pressure transmitter is in a working state when the power is off, and a closed loop II formed by the vertical C and B ends, the pitot tube probe and the compressed gas pipe connected in parallel with the micro differential pressure transmitter is in a working state when the power is on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010546796.6A CN111624145A (en) | 2020-06-16 | 2020-06-16 | Dust concentration on-line monitoring system based on dust concentration meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010546796.6A CN111624145A (en) | 2020-06-16 | 2020-06-16 | Dust concentration on-line monitoring system based on dust concentration meter |
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| CN111624145A true CN111624145A (en) | 2020-09-04 |
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| CN202010546796.6A Pending CN111624145A (en) | 2020-06-16 | 2020-06-16 | Dust concentration on-line monitoring system based on dust concentration meter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525436A (en) * | 2020-12-16 | 2021-03-19 | 浙江大学 | System for detecting damage of filter bag based on charge method and detection method thereof |
| CN113042189A (en) * | 2021-03-16 | 2021-06-29 | 广州敏远能源科技有限公司 | Multi-parameter monitoring system and method for pulverized coal particles of boiler coal mill |
| CN114459972A (en) * | 2022-01-28 | 2022-05-10 | 青岛众志测控技术有限公司 | High-reliability dust detection system and detection method |
| CN114602265A (en) * | 2020-11-23 | 2022-06-10 | 湖南华中天地环保科技有限公司 | Dust removal sack surface damage detection device based on dust collecting equipment |
| CN116933977A (en) * | 2023-09-13 | 2023-10-24 | 邹城美安系统集成有限公司 | Building construction monitoring system based on big data |
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| CN110530434A (en) * | 2019-10-09 | 2019-12-03 | 北京华电天仁电力控制技术有限公司 | A kind of coal dust pulverized coal feed pipe apoplexy powder speed and coal powder density self-operated measuring unit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114602265A (en) * | 2020-11-23 | 2022-06-10 | 湖南华中天地环保科技有限公司 | Dust removal sack surface damage detection device based on dust collecting equipment |
| CN114602265B (en) * | 2020-11-23 | 2023-08-15 | 湖南华中天地环保科技有限公司 | Dust removal cloth bag surface damage detection device based on dust removal equipment |
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| CN112525436B (en) * | 2020-12-16 | 2022-10-14 | 浙江大学 | System for detecting damage of filter bag based on charge method and detection method thereof |
| CN113042189A (en) * | 2021-03-16 | 2021-06-29 | 广州敏远能源科技有限公司 | Multi-parameter monitoring system and method for pulverized coal particles of boiler coal mill |
| CN114459972A (en) * | 2022-01-28 | 2022-05-10 | 青岛众志测控技术有限公司 | High-reliability dust detection system and detection method |
| CN116933977A (en) * | 2023-09-13 | 2023-10-24 | 邹城美安系统集成有限公司 | Building construction monitoring system based on big data |
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